I do a basic sanding on the edges of things I build for the chickens. The skin on the soles of their feet are generally quite tough, as well as the scales on their legs. But things can get poked under their scales & that hurts like getting something under your fingernail. Ouch! And I imagine chickens could get pretty painful slivers anywhere else on their bodies where the sliver managed to get past the feathers. Ouch ouch ouch!